rabbitmq 用java客戶端生產和消費消息

用maven項目演示，添加dependency

<!-- https://mvnrepository.com/artifact/com.rabbitmq/amqp-client -->
        <dependency>
            <groupId>com.rabbitmq</groupId>
            <artifactId>amqp-client</artifactId>
            <version>4.2.1</version>
        </dependency>

默認的rabbitmq用戶名和密碼是guest，但是這個賬號有限制，默認只能通過本地網絡訪問，遠程網絡訪問受限。所以添加一個用戶。

lmy@Y480:/opt/rabbitmq/sbin$ rabbitmqctl list_users
Listing users
guest    [administrator]
lmy@Y480:/opt/rabbitmq/sbin$ rabbitmqctl add_user root root
Creating user "root"
lmy@Y480:/opt/rabbitmq/sbin$ rabbitmqctl set_permissions -p / root ".*" ".*" ".*"
Setting permissions for user "root" in vhost "/"
lmy@Y480:/opt/rabbitmq/sbin$ rabbitmqctl list_users
Listing users
guest    [administrator]
root    []
lmy@Y480:/opt/rabbitmq/sbin$ rabbitmqctl set_user_tags root administrator
Setting tags for user "root" to [administrator]
lmy@Y480:/opt/rabbitmq/sbin$ rabbitmqctl list_users
Listing users
guest    [administrator]
root    [administrator]
lmy@Y480:/opt/rabbitmq/sbin$ 

add_user 是增加用戶

set_permissions 為root用戶設置所有權限

set_user_tags設置root用戶為管理員角色

下面編寫一個例子，首先生產者發送一條消息“hello world”至 RabbitMQ中，之后由消費者消費。

下面是生產這客戶端代碼。

package com.lmy.demo.rabbitmq.demo;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.MessageProperties;

public class RabbitProducer {
    private static final String EXCHANGE_NAME="exchange_demo";
    private static final String ROUTING_KEY="routingkey_demo";
    private static final String QUEUE_NAME="queue_demo";
    private static final String IP_ADDRESS="127.0.0.1";
    private static final int PORT=5672; //rabbitMQ 服務端默認端口號為5672
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory=new ConnectionFactory();
        factory.setHost(IP_ADDRESS);
        factory.setPort(PORT);
        factory.setUsername("root");
        factory.setPassword("root");
        Connection connection=factory.newConnection();//創建連接
        Channel channel=connection.createChannel();//創建信道
        //創建一個type="direct"、持久化的、非自動刪除的交換器
        channel.exchangeDeclare(EXCHANGE_NAME,"direct",true,false,null);
        //創建一個持久化、非排他的、非自動刪除的隊列
        channel.queueDeclare(QUEUE_NAME, true, false,false,null);
        //將交換器與隊列通過路由鍵綁定
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, ROUTING_KEY);
        //發送一條持久化的消息；hello world
        String message="Hello world";
        channel.basicPublish(EXCHANGE_NAME, ROUTING_KEY, MessageProperties.PERSISTENT_TEXT_PLAIN,
                message.getBytes());
//        //關閉資源
//        channel.close();
//        connection.close();
    }
}

下面是消費者客戶端代碼

package com.lmy.demo.rabbitmq.demo;

import java.io.IOException;
import java.util.concurrent.TimeUnit;

import com.rabbitmq.client.Address;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
import com.rabbitmq.client.AMQP.BasicProperties;

public class RabbitConsumer {
    private static final String QUEUE_NAME="queue_demo";
    private static final String IP_ADDRESS="127.0.0.1";
    private static final int PORT=5672;
    public static void main(String[] args) throws Exception {
        Address[] addresses=new Address[]{
                new Address(IP_ADDRESS,PORT)
        };
        ConnectionFactory factory=new ConnectionFactory();
        factory.setUsername("root");
        factory.setPassword("root");
        //這里的連接方式與生產者的demo略有不同，注意辨別區別
        Connection connection=factory.newConnection(addresses);//創建連接
        final Channel channel=connection.createChannel();//創建信道
        channel.basicQos(64);//設置客戶端最多接收未被ack的消息的個數
        Consumer consumer=new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope,
                    BasicProperties properties, byte[] body) throws IOException {
                System.out.println("recv message:"+new String(body));
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                channel.basicAck(envelope.getDeliveryTag(),false);
            }
        };
        channel.basicConsume(QUEUE_NAME,consumer);
        channel.basicConsume(QUEUE_NAME, false, "myConsumerTag",new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope,
                    BasicProperties properties, byte[] body) throws IOException {
                String routingKey=envelope.getRoutingKey();
                String contentType=properties.getContentType();
                
            }
        });
        //等待回調函數執行完畢之后，關閉資源
        TimeUnit.SECONDS.sleep(5);
        channel.close();
        connection.close();
    }
}

先運行生產者客戶端，再運行消費者客戶端。可以看到下面的效果。

在網頁管理頁面可以看到。